Tools Required

1. Install the bearing retaining ring into the front case.
2. Using J 36372 and J 8092 , install the front input shaft bearing.



3. Using J 36371 , install the output shaft rear bearing into the output shaft rear retainer housing.



4. Using J 33832 and J 8092 , install the front output shaft rear roller bearing.



5. Using J 36371 , install the front output shaft front bearing.



6. Install the retaining ring in order to secure the front output shaft front bearing.



7. Using J 36373 and J 8092 , install the input gear bearing into the input gear.



8. Using J 33843 , install the output shaft extension housing oil seal.

Lubricate the seal sealing lips with transfer case fluid GM P/N 12378396 or the equivalent.




9. Install the fiber washer into the planetary carrier.
10. Install the input gear into the planetary carrier.
11. Install the fiber washer onto the input gear.
12. Install the steel spacer onto the input gear.
13. Install the snap ring into the planetary carrier snap ring groove.
14. Set the planetary carrier and input gear assembly aside.



15. Using J 33831 , install the input seal into the input bearing retainer.



16. Secure three struts to the synchronizer hub with the retaining ring.

16.1.

The hook end of the retaining ring is inserted into the first strut to hold the strut into place.

16.2.

Then second and third struts are held in place from in front by the retaining ring.




17. Turn the synchronizer over and install the second retaining ring the same as the first retaining ring was installed.

•	Ensure the hook end of the second retaining ring is not installed into the same strut as the first retaining ring hooked end.

•	Any one of the two remaining struts on the bottom side of the synchronizer hub can be used as the starting point for installation of the hooked end of the retaining ring.




18. Install the clutch sleeve over the synchronizer hub.

•	Ensure the spline of the clutch sleeve is aligned with the strut.

•	Ensure the struts are positioned into the strut pockets (recessed area) of the clutch sleeve.




19. Install the drive sprocket, synchronizer and sleeve assembly, synchronizer stop ring, and retaining ring.

•	Ensure the drive sprocket is installed with the cone end (clutch teeth) toward the input end of the main shaft.

•	Ensure the synchronizer stop ring is positioned onto the cone of the drive sprocket.

•	Ensure the clutch teeth mate with the drive sprocket teeth to allow for the retaining ring installation.




20. With all the main shaft parts aligned correctly, the retaining ring should slip and lock into the groove on the main shaft.
21. Install the planetary assembly into the front case.



22. Install the snap ring onto the input shaft.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

23. Install the input shaft bearing retainer to the front case.

23.1.

Apply a thin coat of RTV GM P/N 12345739 or the equivalent to the input shaft bearing retainer mating surface.

23.2.

Apply threadlocker GM P/N 12345382 or the equivalent to the bearing retainer bolt threads.

23.3.

Secure the bearing retainer to the front case with four bolts.

Tighten
Tighten the bearing retainer bolts to 19 N·m (14 lb ft).




24. Position the sector into the front case and through the sector hole.
25. Position the O-ring and plastic washer onto the sector shaft and into the sector shaft hole.
26. Position the shift lever onto the sector shaft and flush against the plastic washer.
27. Secure the shift lever to the sector shaft with the washer and nut.

Tighten
Tighten the nut to 27 N·m (20 lb ft).





Important: Prior to installation of the low range fork, ensure the pads on the low range fork have been replaced with new pads.

28. Position the range shift hub into the low range fork.




Important: During installation of the low range fork, sleeve, and hub assembly onto the planetary assembly, ensure the roller of the sleeve assembly is positioned onto the sector slot.

29. Position the low range fork, sleeve, and hub assembly onto the planetary assembly and case.




Important: Prior to installation of the mode fork, ensure the pads on the mode fork have been replaced with new pads.

30. Position the mode fork onto the mainshaft.



31. Position the main shaft and mode fork into the front case and sleeve assembly.

31.1.

Position the main shaft into the hub and planetary assembly.

31.2.

Position the shaft of the mode fork into the sleeve assembly.




32. Position the mode fork retaining spring and the retaining spring cover onto the mode fork shaft.



33. Install the front output shaft and drive chain into the front case and onto the main shaft.



34. Secure the rubber tube to the oil pickup screen and oil pump tube
35. Secure the oil pickup screen to the rear case.
36. Position the O-ring into the oil pump port.
37. Position the oil pump to the bottom of the rear case and secure the oil pickup tube to the oil pump.




Notice: Apply the proper amount of sealant to the flange when assembling the transfer case. Excessive amounts of sealant can plug the oil pump screen, resulting in internal component failure.

Important: Ensure both sealing surfaces of the front and rear case halves are free of dirt, oil, and cleaning solvent.

38. Apply a thin coat of RTV sealant GM P/N  12345739 or equivalent to the mating surface of the front case.
39. Position the rear case onto the front case.
40. Apply threadlocker GM P/N  12345382 or equivalent to the case bolts.
41. Install the two bolts with the washers into the doweled case holes.
42. Install the remaining case bolts.
43. Secure the rear case to the front case with the case bolts.

Tighten
Tighten the case bolts to 31 N·m (23 lb ft).




44. Install the speedometer tone wheel retaining ring onto the rear output shaft.
45. Install the speedometer tone wheel onto the rear output shaft .

Ensure the tone wheel is flush against the retaining ring.

46. Install the speedometer tone wheel second retaining ring.

Ensure the retaining ring is positioned into the groove in the rear output shaft.




47. Apply a thin coat of RTV sealant GM P/N  12345739 or equivalent to the mating surface of the rear output shaft bearing cover

Ensure no RTV is applied or push into the oil return port on the rear output bearing cover

48. Secure the rear output bearing cover to the case with the five bolts.

Tighten
Tighten the bolts to 41 N·m (30 lb ft).




49. Position the bearing retaining ring onto the groove on the rear output shaft.



50. Position the rear extension housing onto the output bearing cover with the weep hole positioned down.
51. Secure the rear extension housing to the output bearing cover with four bolts.

Tighten
Tighten the bolts to 31 N·m (23 lb ft).




52. Using J 33843 , Install the front output shaft seal into the front case and onto the front output shaft.
53. Install the retaining ring onto the output shaft groove.
54. Install the plastic washer onto the output shaft and up against the retaining ring.
55. Install the second retainer ring into the groove at the end of the output shaft.



56. Install the detent plunger, plunger spring, O-ring, and plunger plug.

Tighten
Tighten the plunger plug to 15 N·m (11 lb ft).




57. Install the speed sensor.

Tighten
Tighten the speed sensor to 31 N·m (23 lb ft).